Hibiscus plant named ‘Whit XX’

ABSTRACT

A new and distinct cultivar of winter hardy hibiscus named ‘Whit XX’ is the result of a chance seedling among a seedling population specifically grown for the purpose of screening for variations. This new and distinct cultivar is characterized by being dwarf in stature relative to the species and all other seedlings from the same parent, has blood red flowers that are between about 3.5 and about 6 inches in diameter. The plant is further characterized as having unusually dark green, broadly lanceolate leaves, with a uniform growth habit of dense, stiff branches. Flower production occurs from early July to frost in north central Oklahoma.

Genus and species: Hibiscus moscheutos.

Varietal denomination: Hardy Hibiscus ‘Whit XX’.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a new and distinct variety or cultivar of theherbaceous perennial, Hibiscus moscheutos, commonly known as hardyhibiscus or common mallow.

2. Description of the Related Art

Hardy hibiscus is native to wet areas over much of the eastern third ofthe United States and has been grown as a garden plant since the earlysettlements. The new and distinct plant of this invention was discoveredas a selected seedling whose parent was a single, large, isolated butopen pollinated parent that had been growing on the same farmstead innorth central Oklahoma for over 30 years. The parent plant was aboutseven to nine feet tall and produced pink flowers that were about eightto eleven inches in diameter.

The inventor of this new and distinct hardy hibiscus gathered a largequantity of seeds from the parent plant and planted them all. Althoughonly a fraction of the planted seeds germinated, 854 seedlings resultedand were transplanted into rows in a field as part of a breedingprogram. The new plant of this invention was one of those seedlings andwas distinctly different from both the parent plant and its othersiblings, being characterized as having a dwarf growth habit, dense,stiff branches, unusually dark green leaves and blood red flowers.

This new and distinct plant has been asexually propagated. Asexualreproduction of the new plant was accomplished by rooting cuttings takenfrom the original plant in Stillwater, Okla. Each successivereproduction of the new plant by cuttings has shown the unique featuresthat characterize this new hardy hibiscus indicating that the uniquefeatures of this plant are stable. Growth, flowering, flower color,foliage color and disease resistance remain constant with the ‘Whit XX’cultivar.

SUMMARY OF THE INVENTION

The present invention resulted from the discovery of a new and distinctvariety of hibiscus, Hibiscus moscheutos, which has been given thecultivar name ‘Whit XX’. ‘Whit XX’ is characterized as being dwarf instature relative both to the species and to all other seedlings from thesame parent. This new variety of hibiscus is further characterized ashaving blood red flowers having a diameter of between about 3.5 andabout six inches and as having unusually dark green, broadly lanceolateleaves. The new variety of hibiscus has a uniform growth habit of dense,stiff branches. Flower production occurs from early July to frost innorth central Oklahoma.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a full color photographic view of my new hibiscus plant infull flower in Oklahoma.

FIG. 2 is a full color photographic view of a flower of the plant shownin FIG. 1.

FIG. 3 is a full color photographic view of the range of leaf sizes andshapes found on a typical specimen of my new hardy hibiscus plant.

FIG. 4 is a full color photographic view of the original specimen of thepresent invention, shown in the field for size comparison to typicalseedlings from the same parent and of the same age as my new hardyhibiscus plant.

BOTANICAL DESCRIPTION OF THE PLANT

The following botanical description is of the new and distinct cultivarof the hardy hibiscus, Hibiscus moscheutos, named ‘Whit XX’. Specificcolor designations set forth by number designations are in accordancewith The Royal Horticultural Society Colour Chart. General colorrecitations are consistent with ordinary American color terminology.

‘Whit XX’ has not been observed under all possible environmentalconditions. It is to be understood that the phenotype may varysignificantly with variations in environment such as soils, temperature,light intensity, and length of day, without any difference in thegenotype of the plant. The following botanical characteristics andobservations are taken from the plant when grown under normal outdoorconditions in north central Oklahoma. The described plant was threeyears old and was planted in a three gallon container. Plants grown inone gallon or three gallon containers for one year exhibited no changein characteristics.

The plant:

Type.—Herbaceous perennial.

Classification.—Hardy hibiscus plant, Hibiscus moscheutos.

Origin.—An open pollination of an unnamed female hibiscus plant and anunknown male hibiscus plant.

Parentage.—The parent plant was about seven to nine feet tall andproduced pink flowers that were about eight to eleven inches indiameter. The parent plant had a loose, open growth in north centralOklahoma. The parent plant, destroyed in a fire, was an unnamed hibiscusplant.

Propagation.—The plant is easy to propagate, with the distinguishingcharacteristics of each reproduction of the asexually propagatedoffspring remaining identical to the parent.

Size and shape.—The growth habit of the plant forms a dense, low mound.The growth rate is vigorous in late spring to early summer, with verylittle new growth thereafter. The plant form is characterized as bushyannual growth from perennial roots. In north central Oklahoma, the plantsize is characterized as having a height of between about 20 and about40 inches, with a spread of between about 30 and about 45 inches.

Hardiness.—USDA hardiness zones 5 through 9.

General health and pest susceptibility.—The plant is very resistant topowdery mildew and other diseases, although minor damage fromgrasshoppers may occur.

Folliage:

Arrangement on stems.—Alternate.

Shape of leaves.—Broadly lanceolate. Acuminate to caudate at the tip.Rounded to slightly truncate at the base.

Size of leaves.—Variable, with leaf blades ranging from between about 2and about 6 inches long and from between about 2 and about 4 incheswide.

Margins of leaves.—Irregularly crenate.

Color of leaves.—The upper surface of young and old leaves isapproximately RHS 147-A or B. The primary veins in the upper leafsurface that are in full sun are approximately RHS 187-A. The lowersurface of young and old leaves and the primary veins are approximatelyRHS 191-A or B.

Surface texture of leaves.—Rough, variably rugosa.

Leaf petiole.—The leaf petiole is between about 1 and about 2.5 incheslong. The color, when exposed to full sun, is approximately RHS 182-B.The color when not exposed to full sun is approximately RHS 191-A or Bor RHS 152-A or B.

Stipules.—None.

Stems.—The stems are stout with limited flex. The stem diameters at ornear the soil line range from between about 0.5 and about 1.5 inches.Stem growth starts in the spring and extends continuously with no nodesuntil the plant's full height is reached. Flowering then begins.

Stem color.—The color of young stems and old stems in shade isapproximately 147-B or C, transitioning to approximately R.H.S. 182-A, Bor C when they are exposed to full sun.

Flowers:

Blooming period.—The plant blooms from early July to frost in northcentral Oklahoma.

Blooming habit.—Single blooms in the leaf axils. However, there may beone to four blooms at the tip of a branch and from one to twenty or moreblooms on a plant at any one time.

Flower buds.—The flower buds have a diameter of between about one andabout 1.5 inches and a length of between about 1.25 and about 2.5inches. The color of the calyx is approximately RHS 191-A.

Flower size, fragrance and lastingness.—The flowers have a diameter ofbetween about 3.5 and about six inches and have a depth of between about1 and about 3 inches. The flowers have no fragrance and each flowerlasts for one day.

Flower shape.—Near flat face with overlapping petals to slightly funnelform.

Number of petals.—Most of the flowers have five petals, but occasionallya flower may have four, six or seven petals.

Color of petals.—The blade of petals is approximately RHS 187-A or Bwhen the flower first opens. A few hours after opening, the color of theblade of the petals lightens to RHS 187-B or C or 59-A or B. The colorof the upper and lower petal surfaces are identical.

Shape of individual petal.—Broadly obovate. The petal apex is slightlywavering or undulating and the base and side margin is smooth.

Texture of petal.—Smooth, velvet-like.

Color of petal claw.—White, approximately RHS 155-A or B.

Color of stamen tube.—White, approximately RHS 155-A or B.

Number of stamens and pistils.—There are many stamens. Typically, thereare 5 pistils but occasionally, only 3 or 4.

Stigma.—White, approximately RHS 155-A or B.

Exposed portion of style.—White, approximately R.H.S. 155-A or B.

Pollen color.—Light yellow, approximately RHS 12-B, C or D.

Peduncle.—The peduncle, the stalk of a single flower, is between about0.5 and about one inch long, is stout, and has a color that isapproximately RHS 147-B or C.

Sepals.—There are five sepals that are fused at the base to make acup-like calyx, subtended by an epicalyx of between about 10 and about18 bracts. The tips of the sepals are lanceolate. The sepals aretypically between about 1.5 and about 2.5 inches long. Individual bractsare quite variable but typically range from between about one-half andabout 2.5 inches long and between about one-eighth and about one-fourthinch wide. The color of the sepals and bracts range from between aboutRHS 147 A or B when the plant is in full sun and about RHS 191 A or Bwhen shaded.

Seed pods.—Few seed pods are produced as the plant is mostly sterile.The color of old dry sepals surrounding the seed pod is approximatelyRHS 165-A or B. A young, immature seed pod is green, approximately RHS151-A, soon after petal drop. The color changes to brown, approximatelyRHS 200-A or B, with age.

Individual seeds.—The seeds are more or less round, having a diameter ofabout ⅛ inch. The seeds are brown in color, approximately RHS 200-B orC.

I claim:
 1. A new and distinct variety of a hardy hibiscus plant,substantially as illustrated and described.